I have a 1972 429 with D3ve-a2a heads and I am trying to increase its performance. I have read on this forum that if I install a timing chain and sproket from a 68-71 429 that it will really help my engine's performance. On ebay I have seen new performance timing chains and sprokets. What I am wondering is, which would be better, an original timing setup from 68-71, or a new setup? Any info would be great.